/*-
 * Copyright (c) 2008-2010, Oleg Estekhin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *  * Neither the names of the copyright holders nor the names of their
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package oe.assertions.predicates.numbers;

import oe.assertions.util.Relation;

/** Compares two numbers using floating-point total order semantics except that NaNs are treated as unordered. */
public class NumberOrderComparator<T extends Number> extends NumberRelationComparator<T> {

    @Override
    protected Relation calculateDouble( double a1, double a2 ) {
        if ( Double.isNaN( a1 ) || Double.isNaN( a2 ) ) {
            return Relation.UNORDERED;
        } else {
            int i = Double.compare( a1, a2 );
            return i < 0 ? Relation.LESS_THEN : i == 0 ? Relation.EQUAL : Relation.GREATER_THEN;
        }
    }

    @Override
    protected Relation calculateFloat( float a1, float a2 ) {
        if ( Float.isNaN( a1 ) || Float.isNaN( a2 ) ) {
            return Relation.UNORDERED;
        } else {
            int i = Float.compare( a1, a2 );
            return i < 0 ? Relation.LESS_THEN : i == 0 ? Relation.EQUAL : Relation.GREATER_THEN;
        }
    }

}
